--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/AuthTokenGenerator.py	Thu Mar 15 10:20:24 2012 +0100
@@ -0,0 +1,39 @@
+from OFS.SimpleItem import SimpleItem
+
+import datetime
+import hashlib
+
+
+ZERO = datetime.timedelta(0)
+class Utc(datetime.tzinfo):
+    def utcoffset(self, dt):
+        return ZERO
+
+    def tzname(self, dt):
+        return "UTC"
+
+    def dst(self, dt):
+        return ZERO
+UTC = Utc()
+
+
+class AuthTokenGenerator(SimpleItem):
+    """Generator of auth tokens for OKFN Annotator""" 
+    # Replace these with your details
+    consumerKey = 'yourconsumerkey'
+    consumerSecret = 'yourconsumersecret'
+    
+    # Only change this if you're sure you know what you're doing
+    CONSUMER_TTL = 86400
+
+    def generate_token(self, user_id):
+        issue_time = datetime.datetime.now(UTC).isoformat()
+        token = hashlib.sha256(self.consumerSecret + user_id + issue_time).hexdigest()
+    
+        return dict(
+            consumerKey=self.consumerKey,
+            authToken=token,
+            authTokenIssueTime=issue_time,
+            authTokenTTL=CONSUMER_TTL,
+            userId=user_id
+        )